talk of的使用方法

这里的talk of 能否换成talk？能否直接说talk sth

譬如：They were talking baseball/politics.他们在聊棒球/政治。to talk business谈正事  

talk of是提及，前文已有铺垫。虽然talk可以作及物使用方法，一般仅限于解 talk sport/politics/business等，泛指某个话题；如实具体状况，一般为talk about.